US1778062A - Adapter for vacuum-tube sockets - Google Patents

Description

Oct. 14,1930.` l G, BUTZKE 1,778,062

ADAPTER FOR VACUUM TUBE SOCKETS Filed June 5, 192s Inv ar-(Cori Hi s fll omweg.

GUS-lav Buz Ke,

Patented Oct. .'14, 1930v UNI-TED STATE-s PATENT ori-ica GUSTAV BUTZKE, F SCHEI CTADY, NEW YORK, ASSIGISOR TO GENERAL ELECTRIC I COMPA Y, ACORPOBATION 0F NEW YORK ADAPTER FOR VACUUM-TUBE SOCKETS Application mea :rune 5, 192s. serial No. 643,593.

The present invention relates to the wireless communication art, and more especially to the means for mechanically supporting and electrically connecting in circuit the vacuum 5 tubes commonly known as radiotrons.

The sockets or receptacles for the standard radiotrons are made with a base receiving recess of about one and tbree-eighthsv inches in diameter and with the filament contacts arranged-at twoadjacent corners of a rectangle and the grid and plate contacts at the other two corners.- The miniature radiotrons, which have come into recent extensive use, have a base about one inch in diameter and .15`with the plate and grid contacts transposed or arranged diagonally thereon and a cord ingly is incapable of being directly mounted in standard radiotron sockets or receptacles...

The object of the present invention is to 2o provided a hardy, compact and easily applied adapter whereby a miniature vacuum tube may be readily and properly connected to a standard radiotron socket or receptacle.

One embodiment of the invention is shown in the accompanying drawing in which Fig. 1 is a top plan view of my adapter; Fig. 2 is a vertical sectional View of the outer shell on line 2-2 of Fig. 1 with thel base plate and f contacts shown'in` osition in .side elevation;

Fig. 3 is a dissemb ed perspective view'with the shell in part section, and Fig.` 4 is a dissembled perspective view of thecontacts and the interior base plate.

The supporting member comprises a shell A 1 made of insulating compound in the form of a cup with a peripheral flange 2 knurledat its edge 3 to provide a good hand hold. The exterior size and shapel thereof vcorrespond with those of the base of the standard vacuum 19 tube. It has a radial positioning and holdling spur 4 secured in its cylindrical outer Wall :for engagement with the bayonet slot of the socket and four countersunk apertures 5 symmetrically disposed in the bottom part 6 for the passage therethroughpf the external con tact lingers 7.

The base plate 8, forming the inner part of the support, is made'of insulating` compound in the form of a disk adapted to lit the recess 5o of the shell 1. Y 'It has a peripheral notch 9 f advance. p

l22 and all contacts have intermediate shank adapted to receive a feather lug 10 formed on the inner wall of the shell near the -bottom thereof and serving angularly to position the base plate therein. The base plate 8 and the .bottom 6 of the'shell have axial holes 11 and 12 for the passage of an assembly screw 1? which is adapted to engage a nut 14 carried by the base plate.

The contact fingers 7 have shouldered projections 15, while their inner ends are threaded for engagement with -nuts 16 set in the upper side of the plate about the holes 17 formed therein for the passage of the vfinger contacts. Rectangular recesses 18 are i formed in the lowerside ofthe base plate 8 about the holes 17 for the reception of similarly shaped ends 19 of the opposite or internal contact s rings which are secured therein by the shoulders 15 of the contact fingers 7 bearing thereagainst when screwed home.

The four opposite spring contacts 20, 21,

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22 and 23 are shaped differently from one ani other due to the transposed or dissimilar arrangement of the contacts on the standard and the miniature vacuum tubes. Contact 20 Vhas its free tip disposed axially above its contact finger 7 andiis accordingly bent into the form of a letter U. Contact 21 has its tip disposed diametrically opposite its contact finger 7 and is made in the form of a long lever. Contact 22 has its tip disposed overl the contact finger 7 ninety degrees in Contact.23 is similar to contact portions 24 ada ted to enter peripheral notches 25 in the ase plate and to be braced by the side walls thereof while the outer portions ofthe spring contacts overlie freely theA outer side/of the,.basep1ate. The tip portions 26 of the spring contacts are made oblong to provide somewhat extended areas upon which the contact fingers 27 (indicated in dotted circles in Fig. 1 ofthe miniature vacuum tube may slide during the angular movement thereof as it is connected to and disconnected fromnthe adapter. AThis con-A nection is the usual bayonet joint consisting of a radial spur on the tube slmllar to ur 4 and an L-shaped slot 28 formed in the inner wall of the shell 1, as shown in Fig. 3.

When the adapter is inserted in a standard vacuum tube socket, the spur4 and its cooperatin bayonet slot definitely position the contact ngers 7 so thatv the left-hand pair, as shown in Fig. 3, may enga e the filament ,terminals while the upper'rig t-hand linger vmy hand this 4th dag'1 posed over the front side thereofwith their order of arrangement differing from that of the socket enga 'ng contacts.,

In witness w ereof, I have hereunto set of June, 1923. USTAV BUTZKE.'A

embodiment of the invention known tolme, Y

I do not desire to be restricted therto.

What I claim as new and desire to secure by LettersPatent of the United States, is,-

' 1. A tube socket adapter lcomprising a cylindrical shell of insulation having external means for attaching and positioning attaching and positioning a tube therein, an

within a tube socket and internal means for attaching and positioninga tube of reduced diameter thereln, a" set of external contacts'l carried by said -shelland adapted to engage socket contacts, and a set of internal contacts directly connected to said external contacts with their free ends'arranged 'in transl posed relation to the external -contacts and adapted to engage tube contacts.

2. A tube socket adapter comprisingl a shell of insulation provided with means for positioning and attaching within a tube socket and for positioning and attaching a tube of reduced diameter therein, an insulatin base mounted in fixed position Within said s ell, a set of external contacts mounted on one side of-said base and adapted to engage socket contacts and a set of internal contacts mounte onsaid external contacts and projecting from the opposite side' of said base in transposed relation to the first set of contacts ang agapted to engage tube contacts. e cylindrical shell vof insulation having external means tube socket adapter comprising a for attaching and ositioning Within a tube socket and interna 'meansfor' I insulating base fixedly positioned within said shell, a set of-external contacts mounted on and pro'ecting -from the rear side of said base, an aset of internal contacts connected to said external contacts and their free ends extending over the front side thereof with the-order of arrangement'difering from that ofthe external contacts.

4. A tube socket adapter conprising an inlsulating disk base havmg a set of peripheral notches, vaqset-of socket vengaging contacts mounted on-and projecting vfrom, the rear -respectively connected to said socket en agmg contacts at tle rearside of said f and their free ends 'e'xtenb'ding through the respectite peripheral notches therein andldis ase side of said base, a set of leaf spring contacts los.

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